Video – dropped icons

Hi, on this page, I have added a Movie (mp4) – from my media library. http://wp6.temp.domains/~xographc/rfd-3d/?preview_id=6215&preview_nonce=e343e2dc6d&_thumbnail_id=6223&preview=true
when you hover over the movie, the Full Screen Icon has dropped to the next line and causing a gap in the row. I would ideally want the Full screen icon on the same row as the other controls so as not to cause the gap.

I dont know why this is happening, can you help please?

The code for the video is:
[video autoplay="on" loop="on" fullscreen="false" width="1280" height="720" mp4="http://wp6.temp.domains/~xographc/wp-content/uploads/2019/06/DRTSteel-Aus_1507940147251-drlcss.mp4" preload="auto"][/video]

Thanks
Steve